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  <title>Spring-SpringBoot-HelloWorld项目启动流程及细节和原理 | Dreamcat</title>
  <meta name="description" content="引言 SpringBoot大大简化了Spring项目的配置，虽然很舒服，但是为了面试等，还是要知道里面的细节和原理呀，再此举个HelloWorld的例子  声明 使用Idea分析，并使用Idea创建SpringBoot的工程。 项目结构就不一一详细说了，大家肯定都知道每个文件是干什么的。 这里主要是负责细看其中的原理和细节。 版本：2.2.4.RELEASE  SpringApplication">
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      Spring-SpringBoot-HelloWorld项目启动流程及细节和原理
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        <h2 id="引言"><a href="#引言" class="headerlink" title="引言"></a>引言</h2><blockquote>
<p>SpringBoot大大简化了Spring项目的配置，虽然很舒服，但是为了面试等，还是要知道里面的细节和原理呀，再此举个HelloWorld的例子</p>
</blockquote>
<h2 id="声明"><a href="#声明" class="headerlink" title="声明"></a>声明</h2><ul>
<li>使用Idea分析，并使用Idea创建SpringBoot的工程。</li>
<li>项目结构就不一一详细说了，大家肯定都知道每个文件是干什么的。</li>
<li>这里主要是负责细看其中的原理和细节。</li>
<li><strong>版本：2.2.4.RELEASE</strong></li>
</ul>
<h2 id="SpringApplication实例"><a href="#SpringApplication实例" class="headerlink" title="SpringApplication实例"></a>SpringApplication实例</h2><p><strong>先看源码：</strong></p>
<pre class=" language-java"><code class="language-java">  <span class="token keyword">public</span> <span class="token function">SpringApplication</span><span class="token punctuation">(</span>ResourceLoader resourceLoader<span class="token punctuation">,</span> Class<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span> primarySources<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>sources <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LinkedHashSet</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">// 1. </span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>bannerMode <span class="token operator">=</span> Mode<span class="token punctuation">.</span>CONSOLE<span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>logStartupInfo <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>addCommandLineProperties <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>headless <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>registerShutdownHook <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>additionalProfiles <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">HashSet</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>resourceLoader <span class="token operator">=</span> resourceLoader<span class="token punctuation">;</span>
        Assert<span class="token punctuation">.</span><span class="token function">notNull</span><span class="token punctuation">(</span>primarySources<span class="token punctuation">,</span> <span class="token string">"PrimarySources must not be null"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>primarySources <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LinkedHashSet</span><span class="token punctuation">(</span>Arrays<span class="token punctuation">.</span><span class="token function">asList</span><span class="token punctuation">(</span>primarySources<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>webApplicationType <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">deduceWebApplicationType</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setInitializers</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getSpringFactoriesInstances</span><span class="token punctuation">(</span>ApplicationContextInitializer<span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">// 3. </span>
        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setListeners</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getSpringFactoriesInstances</span><span class="token punctuation">(</span>ApplicationListener<span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">// 4.</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>mainApplicationClass <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">deduceMainApplicationClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">// 5.</span>
    <span class="token punctuation">}</span></code></pre>
<ul>
<li><code>com.example.helloworld.HelloworldApplication</code>放入到Set的集合中</li>
<li>判断是否为Web环境：存在（javax.servlet.Servlet &amp;&amp; org.springframework.web.context.ConfigurableWebApplicationContext ）类</li>
<li>创建并初始化ApplicationInitializer列表 （spring.factories）</li>
<li>创建并初始化ApplicationListener列表 （spring.factories）</li>
<li>初始化主类mainApplicatioClass  (DemoApplication)</li>
<li><strong>总结：上面就是SpringApplication初始化的代码，new SpringApplication()没做啥事情 ，主要加载了META-INF/spring.factories 下面定义的事件监听器接口实现类</strong></li>
</ul>
<h2 id="ConfigurableApplicationContext的run方法"><a href="#ConfigurableApplicationContext的run方法" class="headerlink" title="ConfigurableApplicationContext的run方法"></a>ConfigurableApplicationContext的run方法</h2><p><strong>看源码，都可以找的到</strong></p>
<pre class=" language-java"><code class="language-java"><span class="token keyword">public</span> ConfigurableApplicationContext <span class="token function">run</span><span class="token punctuation">(</span>String<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        StopWatch stopWatch <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">StopWatch</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">// 1.</span>
        stopWatch<span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        ConfigurableApplicationContext context <span class="token operator">=</span> null<span class="token punctuation">;</span>
        Collection<span class="token operator">&lt;</span>SpringBootExceptionReporter<span class="token operator">></span> exceptionReporters <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">configureHeadlessProperty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        SpringApplicationRunListeners listeners <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getRunListeners</span><span class="token punctuation">(</span>args<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">// 2.</span>
        listeners<span class="token punctuation">.</span><span class="token function">starting</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">// </span>

        Collection exceptionReporters<span class="token punctuation">;</span>
        <span class="token keyword">try</span> <span class="token punctuation">{</span>
            ApplicationArguments applicationArguments <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">DefaultApplicationArguments</span><span class="token punctuation">(</span>args<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">// </span>
            ConfigurableEnvironment environment <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">prepareEnvironment</span><span class="token punctuation">(</span>listeners<span class="token punctuation">,</span> applicationArguments<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">// </span>
            <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">configureIgnoreBeanInfo</span><span class="token punctuation">(</span>environment<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">// </span>
            Banner printedBanner <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">printBanner</span><span class="token punctuation">(</span>environment<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">// </span>
            context <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">createApplicationContext</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">// </span>
            exceptionReporters <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getSpringFactoriesInstances</span><span class="token punctuation">(</span>SpringBootExceptionReporter<span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Class</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">{</span>ConfigurableApplicationContext<span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">}</span><span class="token punctuation">,</span> context<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">prepareContext</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> environment<span class="token punctuation">,</span> listeners<span class="token punctuation">,</span> applicationArguments<span class="token punctuation">,</span> printedBanner<span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment" spellcheck="true">// </span>
            <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">refreshContext</span><span class="token punctuation">(</span>context<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">// </span>
            <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">afterRefresh</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> applicationArguments<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">//</span>
            stopWatch<span class="token punctuation">.</span><span class="token function">stop</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment" spellcheck="true">// </span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>logStartupInfo<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">StartupInfoLogger</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>mainApplicationClass<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">logStarted</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getApplicationLog</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> stopWatch<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>

            listeners<span class="token punctuation">.</span><span class="token function">started</span><span class="token punctuation">(</span>context<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">callRunners</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> applicationArguments<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Throwable</span> var10<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">handleRunFailure</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> var10<span class="token punctuation">,</span> exceptionReporters<span class="token punctuation">,</span> listeners<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IllegalStateException</span><span class="token punctuation">(</span>var10<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token keyword">try</span> <span class="token punctuation">{</span>
            listeners<span class="token punctuation">.</span><span class="token function">running</span><span class="token punctuation">(</span>context<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">return</span> context<span class="token punctuation">;</span>
        <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Throwable</span> var9<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">handleRunFailure</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> var9<span class="token punctuation">,</span> exceptionReporters<span class="token punctuation">,</span> <span class="token punctuation">(</span>SpringApplicationRunListeners<span class="token punctuation">)</span>null<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IllegalStateException</span><span class="token punctuation">(</span>var9<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span></code></pre>
<ul>
<li>创建计时器StopWatch</li>
<li>获取SpringApplicationRunListeners并启动</li>
<li>创建ApplicationArguments</li>
<li>创建并初始化ConfigurableEnvironment</li>
<li>打印Banner</li>
<li>创建ConfigurableApplicationContext</li>
<li>准备ConfigurableApplicationContext</li>
<li>刷新ConfigurableApplicationContext，<strong>这个refreshContext()加载了bean，还启动了内置web容器，需要细细的去看看</strong></li>
<li>容器刷新后动作，啥都没做</li>
<li>计时器停止计时</li>
</ul>
<h2 id="refreshContext"><a href="#refreshContext" class="headerlink" title="refreshContext()"></a>refreshContext()</h2><p><strong>该源码中其实就是Spring源码的refresh()的源码</strong></p>
<ul>
<li><p><strong>不过这里的refresh()是在<code>AbstractApplicationContext</code>抽象类上</strong></p>
</li>
<li><p><strong>其他就不提了，关注点在onrefresh()方法上，但是个空方法，毕竟是抽象类，去找其子类继承的它</strong></p>
</li>
<li><p><strong>debug调试可以找到ServletWebServerApplicationContext</strong></p>
</li>
</ul>
<h2 id="ServletWebServerApplicationContext"><a href="#ServletWebServerApplicationContext" class="headerlink" title="ServletWebServerApplicationContext"></a>ServletWebServerApplicationContext</h2><p><strong>先看个类图吧，很吊</strong></p>
<p><img src="http://media.dreamcat.ink//20200203211202.png" alt=""></p>
<ul>
<li><code>onRefresh()</code>-&gt;<code>createWebServer()</code>-&gt;<code>getWebServerFactory()</code>，此时已经加载了个web容器</li>
<li>可以返回刚才的<code>createWebServer()</code>，然后看<code>factory.getWebServer</code></li>
</ul>
<pre class=" language-java"><code class="language-java"><span class="token keyword">public</span> WebServer <span class="token function">getWebServer</span><span class="token punctuation">(</span>ServletContextInitializer<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span> initializers<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token comment" spellcheck="true">//tomcat这位大哥出现了</span>
        Tomcat tomcat <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Tomcat</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        File baseDir <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>baseDirectory <span class="token operator">!=</span> null <span class="token operator">?</span> <span class="token keyword">this</span><span class="token punctuation">.</span>baseDirectory
                <span class="token operator">:</span> <span class="token function">createTempDir</span><span class="token punctuation">(</span><span class="token string">"tomcat"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        tomcat<span class="token punctuation">.</span><span class="token function">setBaseDir</span><span class="token punctuation">(</span>baseDir<span class="token punctuation">.</span><span class="token function">getAbsolutePath</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        Connector connector <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Connector</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>protocol<span class="token punctuation">)</span><span class="token punctuation">;</span>
        tomcat<span class="token punctuation">.</span><span class="token function">getService</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">addConnector</span><span class="token punctuation">(</span>connector<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token function">customizeConnector</span><span class="token punctuation">(</span>connector<span class="token punctuation">)</span><span class="token punctuation">;</span>
        tomcat<span class="token punctuation">.</span><span class="token function">setConnector</span><span class="token punctuation">(</span>connector<span class="token punctuation">)</span><span class="token punctuation">;</span>
        tomcat<span class="token punctuation">.</span><span class="token function">getHost</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">setAutoDeploy</span><span class="token punctuation">(</span><span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token function">configureEngine</span><span class="token punctuation">(</span>tomcat<span class="token punctuation">.</span><span class="token function">getEngine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">for</span> <span class="token punctuation">(</span>Connector additionalConnector <span class="token operator">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>additionalTomcatConnectors<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            tomcat<span class="token punctuation">.</span><span class="token function">getService</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">addConnector</span><span class="token punctuation">(</span>additionalConnector<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token function">prepareContext</span><span class="token punctuation">(</span>tomcat<span class="token punctuation">.</span><span class="token function">getHost</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> initializers<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> <span class="token function">getTomcatWebServer</span><span class="token punctuation">(</span>tomcat<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span></code></pre>
<ul>
<li>内置的Tomcat就出现了</li>
<li><strong>总结：run() 方法主要调用了spring容器启动方法扫描配置，加载bean到spring容器中；启动的内置Web容器</strong></li>
</ul>
<h2 id="SpringBootApplication"><a href="#SpringBootApplication" class="headerlink" title="@SpringBootApplication"></a>@SpringBootApplication</h2><p><strong>主要是三个注解</strong></p>
<ul>
<li>@SpringBootConfiguration:允许在上下文中注册额外的bean或导入其他配置类。</li>
<li>@EnableAutoConfiguration:启用 SpringBoot 的自动配置机制</li>
<li>@ComponentScan: 扫描常用的注解</li>
</ul>

      
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